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Opening Book (bin) - update

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Dear chess and chess engine lovers,

The "download" subpage on the blog is being reorganized. This is a huge amount of data, so it will take some time. From time to time we add links to megapacks of chess engines, opening books, games and other files. Check the download page regularly - we will improve and add links.

Opening Book (bin)
Adrio Pro 230724EsculapioAdrio Pro 210624AdrianOliva
Pampa3 bin (May 2024)OPTIMUS 3.2Student Opening BookDONb free
Little Cat 8.6cM11.2Perfect 2021Ranomi 170527
CerebellumLight Morphius 12.9cChiron 1.5Hannibal Small
Aarica 2012Stockfish-211-book

Book - BIN format ( Used by chess GUIs Arena, Banksia and Droidfish)

Binary books have some important advantages, especially for computer chess engines: space-efficient, fast on accessing and searching, more useful information. 

At the most simple form, they are just a conversion of above text-opening books into binary, in the ready form for software and save text-binary converting steps. However, the major number of top books is built and worked with hash values from transpositions. Often each position is stored as a hash value (8 bytes) and some extra information such as the number of times occurred, number of games won by white/black / drawn with this position, average/maximum Elo of players playing to this opening position, chess program's success with the position. To save space those extra information typically about 2-8 bytes. 



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